Reduced-speed trip for hoists



D. F. LEPLEY.

REDUCED SPEED TRIP FOR HOISTS.

APPLICATION FILED 050.15. I919.

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REDUCED-SPEED TRIP FOR HOISTS.

Application filed December 15, 1919. Serial No.

To all whom it may concern:

e it known that I, DANIEL F. LEPLEY,

a citizen of the United States, residing at Connellsville, in the countyof Fayette and State of Pennsylvania, have invented a new and usefulReduced-Speed Trip for Hoists, of which the following is aspecification.

This invention relates to mine hoists and more especially to mechanismwhereby the speed of the hoist can be reduced when it is used for thepurpose of hauling men.

it hoist, when used for carrying coal or other material travels at amuch greater speed than practical when men are being hauled. It hasheretofore been the practice to signal the engineman whenever a load ofmen was to be raised or lowered and he would then set the engine so asto move the cage at a safe speed. Owing to misunderstandings of signals,inattention, and other causes, cages filled with men have sometimes beenraised or lowered at the excessive speed employed when coal or the likeis handled, with the result that fatalities have occurred and apparatushas been often wrecked.

One of the objects of the present invention is to provide means underthe control of an operator or eager at the loading point, whereby thespeed of the hoist is reduced independently of any action by the engineman and whereby the normal or high speed can be restored should it bedesired to move the cage upon its return trip while empty or whilecarrying coal or the like.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts which will be hereinafter morefully described and pointed out in the claims, it being understood thatvarious changes may be made in the construction and arrangement of theparts without departing from the spirit or sacrificing any of theadvantages of the invention as set forth in the appended claims.

In the accompanying drawing the preferred form of the invention has beenshown.

In said drawing is illustrated a side elevation, partly in diagram, ofthe apparatus.

Referring to the drawing by characters of reference. 1 designates a footplate under which is arranged a transverse shaft Specification ofLetters Patent.

Patented Nov. 9, 1920.

2 to which is secured a lever 3 provided at its lower end with adownwardly extending tapered eyed. Pivotally connected to a bracket 5 isa lever 6 having a weight 7 whereby its downward movement isfacilitated. Between the ends of this lever is attached the upper end ofa hanger 8 which increases in width downwardly, as shown and is movableupi-vardly and downwardly relative to the lever 23 and also relative toa rod 9 extending through the hanger and on which are mounted opposedcushions 10. The lever 3 and hanger 8 are adapted to be held in elevatedpositions by a rod 11 which connects the lever 6 to an arm 12 extendingat an angle from a lever 13 carrying a pawl 14 adapted to be seated in anotch 15 in a segment 16. A rod 17* is supported under the pawl and hasa weight 18 at its lower end while it is pivotally connected at anintermediate point to a lever 19 fulcrumed as at 20 and having a footpiece 21 connected to one end.

A lever 22 is fulcrumed on a bracket 23 and is pivotally connected atone end to a rod 24: slidable in a post 25 and a weighted latch 26engages this rod and is adapted to be actuated by a rod 27 connected toone arm of a bell crank lever 28 which is adapted to be operated intimed relation with the ascent of the cage of the hoist by suitablemechanism not shown and which constitutes no part of the presentinvention. I

The parts hereinbefore described form, in themselves, no part of thepresent invention but have been shown and described in Patent No.1,216,1423 issued to me on Feb. 13th, 1917. They are so constructed andarranged that, by shifting the rod17 upwardly and releasing the pawl 14:the weighted lever 6 will swing downwardly and lower the hanger 8 sothat its broadest portion will be positioned between the cushions 10.The rod 9 is adapted to move slowly in a longitudinal direction duringthe raising and lowering of a cage and by lowering the hanger one of thecushions 10 will shift the lever 3 to its neutral position sooner thanwould be the case should the hanger be raised, thereby insuring thestopping of the hoist at the landing level and not at the higher ordumping level. This operation has been set forth fullv in my patenthereinbefore mentioned. For the purpose of releasing the pawl byoperating the rod 17, an arm 29 is preferably extended is adapted, whenthe lever downwardly from the lever 19 and is conlever 33.

For the purpose or" limiting the speed of ascent or descent of the hoistcage a lever 34 is :tulcrumed above the lever 6 and has one armconnected by a wire 35 or other flexible element to the lever 6. Anoperating wire 36 or the like is also connected to said arm. The otherarm of the lever 34 has spaced laterally extending ears 3? extending toopposite sides of the lever 3 and carrying stop screws 38. A'stopprojection 39, preterably square, is provided on thelever 3 and 34. isshifted, to lie between the screws 38. Thus when the man hoist t *ip isset by operating the lever 33, whichlowers the hanger 8, it willbeapparent that the descending lever 6 will pull through wire 35 upon onearm of lever This. will cause the ears 37 to move upwardly to positionsat opposite sides of the projection 39 so that when the lever 3 isshifted out of normal position to operate the hoist, its movement willbe limited by the projection 39 coming against one of the screws 38 and,as a'result, the hoist cannot be moved at more than a predeterminedspeed.

lVhen lowering men from the ground level to the shaft bottom the tripmechanism, including lever 6 and hanger 8 is not used. Instead the eagerat the top oi the shaft pulls the wire 36 so as to raise the steps 37and cause the cage to descend at reduced speed.

The lever 3 shown m the drawings is used for operating the brakemechanism of the hoist and another lever corresponding therewith but notshown, 1s used for controlling the action of the engme of the hoist.Both levers are to be constructed as shown and both are to be controlledin their movement by stop lugs 37. extending into the paths of theprojections 39 on the respective levers. By having this duplicatearrangement the two levers will be simultaneously controlled. by theactuation 01 the lever 3 As the use of two levers for the purposespecified is old in my patent mentioned the illustration thereof has notbeen deemed necessary inthe present case. i 7

It is to be understood that the hanger 8 and the parts associatedtherewith are not to be used except in connection with dump cagesemployed for handling both men and coal. 7 r

That is claimed is 1. In hoisting mechanism the combination with amanually operated controlling lever I and a :iro'ection thereon of meansunder the control of a person at the loading point of the hoistingmechanism for movement into the path 01" the projectionto limit thethrow of the lever from neutral position.

2. In hoisting mechanism the combination with a manually operatedcontrolling lever, of means under the control of a person at the loadingpoint of the hoisting mecha- "nism, for limiting the throw of the leveraway from neutral position. 7

3. In hoisting mechanism the combination with a manually operatedcontrolling lever, of adjustable means under the control of a personlocated at the place of loading for limiting the movement of said leveraway from its neutral position.

4. In a hoisting mechanism the combination with a manually operatedcontrolling l6V61,0f a stop lever, stop devices thereon and at oppositesides of the controlling lever, and means operated by a person locatedat theplace of loading tor shifting the stop lever and positioning thestop devices to limit the movement of the-controlling lever away fromneutral position.

In hoisting mechanism the combination with a controlling lever, and manhoist trip mechanism including a weighted lever and a hanger, andmeansoperated by a person located at the point of. loading for releasing

